Unicorn

Definition - What does Unicorn mean?

A unicorn in polyamory or swinging lifestyles is usually a bisexual single female who is willing to have sex or enter a relationship with an established couple. Although unicorns are usually female, this term can apply to persons of other genders. Because this type of person is hard to find, they are akin to the rare, mythical unicorn.

Kinkly explains Unicorn

In the context of swinging, a unicorn is a woman who will have sex with both partners with no strings or drama attached. For poly arrangements, a unicorn may be expected to be a part of a closed triad, meaning she will not date anyone outside of the three-person relationship. Sometimes this phrase is considered derogatory as it regards the unicorn as a play-toy that isn’t free to pursue their own desires.